Automatic radio frequency signal level control apparatus for a video cassette recorder

DETAILED DESCRIPTION It is an object of the present invention to provide an automatic RF signal level control apparatus for a VCR which can compensate for the level difference between RF channel signals recorded or reproduced by respective channel heads, thereby achieving the RF signal process with high picture quality and with high sound quality.
The automatic RF signal level control apparatus for a VCR according to the present invention comprises: a plurality of pre-amplifying means for amplifying RF channel signals recorded or reproduced by a plurality of channel heads, respectively; a plurality of conversion means for detecting the levels of said pre-amplified RF channel signals, and converting the detected level signals into gain control signals for said plurality of pre-amplifying means, respectively; detecting and comparing means for detecting and comparing the levels of said gain control signals from said plurality of conversion means with each other and providing a switching control signal as information on a compensation-required channel according to the result of comparing; and switching means, switch-controlled according to said switching control signal from said detecting and comparing means, for selecting one of said gain control signals from said plurality of conversion means and feeding back the selected gain control signal to the corresponding pre-amplifying means so as to compensate for the output level of the corresponding preamplifying means.